(1)讓，允許(allow to do sth;permit)[C+n+to-inf，無pass](如上下文清楚，常略去后面的不定式)：He won't～us do it . 他不準(zhǔn)我們做此事。We can't～this go on. 我們不能讓這事繼續(xù)下去。Will you～me smoke? 我能抽煙嗎? I'd love to come but my parents won't～me. 我很想去，但是我的父母不讓?！挤础絝orbid，prohibit;
?(2)準(zhǔn)許活動、進(jìn)入或通過(allow to move，enter or pass)[T+n+prep，T+n+adv]：Who～you into the building? 誰讓你進(jìn)入這座大樓的? Please～me in/into the room. 請讓我進(jìn)來?！玹he dog out (of the room) 把狗(從屋子里)放出去;～sb by/past 讓某人過去;～the curtain down 放下窗簾;～in light and air 讓光線和空氣進(jìn)來;～sb through/a report through 讓某人通過/通過一報告;
?(3)(用于祈使句)(used as an imperative)[C+n+to-inf，無pass]1)讓，允許(allow) (let us不可縮寫為let's)：L～us know what you're going to do. 請告訴我們你們要做什么。L～us buy you a drink. 我們來請你喝一杯。L～me try. 讓我來試一試。2)(用于提出建議或計劃，包括對方在內(nèi)，let us?？s寫為let's)：“L～'s go for a walk. What do you say?”“All right. L～'s.”“咱們?nèi)ド⒉桨?。你意下如?”“好吧，咱們?nèi)グ?。”L～'s go for a ride/go home. 咱們?nèi)ザ碉L(fēng)吧/回家去吧。Mama，you're ill. L～me get the doctor. 媽媽，你病了。我去請醫(yī)生吧。L～'s not get angry/Don't ～'s get angry. 我們不要發(fā)火。(注意上述否定句，前一句被認(rèn)為更加正確，在書面語中比第二句更常見。) 3)(表示要求、命令或威脅等)： L～him be here by ten o'clock/him tell all the facts. 叫他10點以前到這兒來/把實話都說出來。L～every man do his duty.人人都要盡責(zé)。If they will not work，～them starve. 他們不愿意干活就讓他們挨餓。4)(表示假設(shè))： L～AB be equal to CD. 設(shè)AB等于CD。 L～X be the unknown quantity. 設(shè)X為未知數(shù)。
?(4)出租(allow to use in exchange for regular payments)[T+n，T+n+prep(to)，T+n+adv(out/off)，I]：～(out)a house/cottage/shop/flat/room/field (to sb) 把房子/小型別墅/商店/公寓/房間/一塊田地出租(給某人);have rooms to～有房屋出租;～a boat by the hour/at low rents 以小時計費/低租金租船;～the top floor of one's house to two young men 把房子的頂層租給兩個年輕人;The six floors of this large building were～off as separate flats. 這座大樓中有六層是按套房出租的。This house is to (be)～. 此房出租。To～. 出租(招牌用語)。The apartment～s on a yearly basis. 這套公寓按年出租?！纪絩ent;
?let sb/sth be 不要打擾 L～her be;she has a headache. 不要打擾她，她頭疼。
?let bygones be bygones 過去的事情就算了，既往不咎：We should～bygones be bygones and try to get along with each other. 我們應(yīng)該既往不咎，和好相處。
?let drop/fall(似乎無意，實則有意)說出，故意漏出：He～drop the suggestion that we should meet him in town. 他似乎無意地提出我們應(yīng)該在城里同他會面。
?let go (of)放開，松手：He～go the boy. 他松開抓著男孩的手。Don't～go of the dog. 不要放開這只狗。
?let it go(at that)算了，就此為止：I don't agree with all you say but we'll～it go at that. 你說的話我不是都同意，但是我們就此為止吧。
?let oneself go 1)言行隨便，不拘束：Judge Brown～himself go at the reunion of his old class and had a good time. 布朗法官在老同學(xué)的聚會上很隨便，玩得很痛快。2)放松，松懈：The cowboys worked hard all week，but on Saturday night they went to town and～themselves go. 牛仔們整個星期辛苦地工作，但是星期六晚上他們?nèi)コ抢锉M情地玩?zhèn)€痛快。
?let loose 放開，讓自由活動：He caught her arm and would not～loose. 他抓住她的胳膊不放手?！玜 dog loose 放開狗讓它自由活動;
?let me see 讓我想一想：L～me see. Where did I put the key? 讓我想一想，我把鑰匙放哪兒了?
?let sleeping dogs lie (prov)莫惹是非：Don't tell Father that you broke the window. L～sleeping dogs lie. 不要告訴爸爸你打破了窗戶玻璃，別惹麻煩。
?let the cat out of the bag泄露秘密，露餡：We wanted to surprise Mary with a birthday gift，but Allen～the cat out of the bag by asking her what she would like. 我們想意外地送給瑪麗一件生日禮物，但是艾倫問她想要什么就露了餡。
?let well enough alone 滿足于已經(jīng)很好的事，不要過頭：John wanted to make his kite go higher，but his father told him to～well enough alone because it was too windy. 約翰想讓風(fēng)箏飛得再高一點，但是他父親告訴他因為風(fēng)太大，這樣已經(jīng)夠高了。
?let down (v adv) 1)辜負(fù)，使失望，失信(vt)：The team felt they had～the coach down. 隊員們感到辜負(fù)了教練的期望。I've been badly～down. 我非常失望。2)放長(衣服)(vt)：～a hem down 放出折邊;She～the dress down several centimeters. 她把那件女衫放長了幾厘米。
?let in (v adv) 1)滲，漏(vt)：These shoes～in water. 這些鞋子漏水。2)把衣服改瘦些(vt)：The trousers need～ting in at the waist. 這條褲子的腰部需要改瘦些。
?let in for (v adv prep) 使陷入麻煩等(vt)：It could～us in for trouble. 這可能會使我們陷入麻煩。
?let in on/into (v adv prep/prep) 使知道(秘密等)(vt)：I've heard something very funny and I'll～you in on it after class. 我聽到一件很有趣的事，下課后告訴你。She has been～into the secret. 她已得知了那個秘密。
?let off (v adv) 1)開槍，引爆，燃放(vt)：～off guns/fireworks/a bomb 開槍(炮)/燃放煙火/引爆炸彈; 2)放過，饒恕(vt)：She～him off lightly. 她輕易放過了他?！玸b off with a fine/without punishment 對某人罰款了事/免于懲罰; 3)放出(vt)：～off steam 放出蒸汽; 4)允許不做某事，放假(vt)：The teacher～the students off their homework that evening. 老師那天晚上沒給學(xué)生留作業(yè)。He was～off for a week's vacation. 批準(zhǔn)他度假一周。
?let on (v adv) 1)泄露，讓人知道(vt & vi)：Don't～on that I was late. 別告訴別人我遲到了。I never～on about what you told me. 你對我說的話我從來都沒講出去。He knew where the boy was but he didn't～on. 他知道那個男孩在哪兒，但他就是不說。2)假裝(vt & vi)：The old man likes to～on that he is rich. 那個老人喜歡裝出他很富有。He～on like he didn't hear a word they said. 他假裝好像沒聽見他們說的話。
?let out (v adv) 1)讓出去(vt)：Mother won't～us out when it rains. 下雨時媽媽不讓我們出去。2)發(fā)出(vt)：～out a sigh/shriek 嘆一口氣/發(fā)出一聲尖叫; 3)泄露，說出(vt)：～out a secret/the news 泄露秘密/透露消息; 4)放寬(長)衣服(vt)：His trousers need to be～out round the waist. 他的褲腰需要放寬。5)加速(vt)：He turned into an expressway and～the car out. 他把車子開上高速公路，然后加速前進(jìn)。6)免除責(zé)任(義務(wù)等)(vt)：Frank has shoveled the snow from the sidewalk. That～s me out.弗蘭克已經(jīng)把便道上的雪鏟走了，我就不用干了。7)解雇(vt)：Some workers will probably be～out. 有些工人可能要被解雇。8)結(jié)束(散)(vt & vi)：The coach～us out from practice at three o'clock. 教練3點鐘結(jié)束訓(xùn)練讓我們解散。School～s out at four o'clock. 學(xué)校4點鐘放學(xué)。
?let slip 1)無意說出：The girl～slip that she had been a witness to the accident. 那個女孩無意中說出她是那次事故的目擊者。2)錯過：We mustn't～slip such an opportunity. 我們一定不要錯過這樣一個機(jī)會。
?let up (v adv) 1)減小(弱)(vi)：The rain/snow～up. 雨/雪漸漸小了。2)松勁，停止(vi)：They didn't～up，even though they were winning. 即使快贏了他們也不松勁。He works all day and never～s up. 他整天工作，一刻也不休息。
?→′let-down n 失望;′let-up n 減少，放松，和緩;
?【辨異】1)let與allow和permit的區(qū)別見ALLOW。2)let與hire和rent的區(qū)別見HIRE。